Corner mounting device for sheaves and the like



June 30, .1959

M. c. ADDICKS 2,892,606

CORNER MOUNTING DEVICE FOR SHEAVES AND THE LIKE Filed Oct. 26 1953' 4Sheets-Sheet 1 I 1 I 1 I 1 1 I I 1 I 1 1 I I 1 I I I I 1 1 1 1 I 1 I 1 I1 I I 1 I 1 I I 1 II IN V EN TOR.

June 30, 1959 M. C.'ADDICKS 2,392,606

CORNER MOUNTING DEVICE FOR SHEAVES AND THE LIKE Filed Oct. as, 1953 4Sheets-Sheet 2 .33 4 32 w\\\\\\\\\\\\\\mx\\\\\\\\ k\\\\ IN V EN TOR.

June 30, 1959 Filed Oct. 26, 1955 M. c. ADDICKS I 2,892,606

CORNER. MOUNTING DEVICE FOR SHEAVE S AND THE LIKE 4 Sheets-Sheet 3 15INVENTOR.

June 30, 1959 M. c. ADDICKS 2,892,606

CORNER MOUNTING DEVICE FOR SHEAVES AND THE LIKE Filed Oct. 26, 1953 4Shee ts-Sheet 4 @MIW i 094 INVENTQR. v

and return directions.

coRNER MOUNTING DEVICE FOR sHEAvEs AND THE LIKE r Mentor C. Addicks,Minneapolis, Minn.

Application October 26, 1953, Serial No... 388,116 22 Claims. (Cl.248-216) My invention relates generally to anchoring devices, and morespecifically to releasable anchoring devices adapted to be mounteddiagonally across inside corners of anenclosure. 1

' In the emptying of large containers or enclosures such as railroadboxcars, bins, ship holds and thelike, of granular bulk material, suchas grain, unloading mechanism including power operated scoop or shovelis generally used. Such mechanism usually involves one or more poweroperated winding .drums, cable wound there- .on, and a'scoop or shovelattached to the cable. Some such machines require thatthe scoop bemanually removed to a' point remote from the place of discharge, .afterwhich the scoop is drawn to the place of discharge ablelocation remotefrom the point of delivery, so that the return cable may run thereove'r.Heretofore, the tail sheave has been secured to a hook driven into anend wall of the enclosure or to a plate secured to said end wall bynails or the like. Other means for supporting the tail sheave hasincluded a relatively heavy beam :extending the entire width of theenclosure and nailed or otherwise rigidly secured to the oposite sidewalls thereof. These devices have proved unsatisfactory in that, pulleyssecured to the end wall often work loose and become de tached therefrom,and in the case of anchoring beams extending across the width of theenclosure, valuable time and effort is consumed in the proper mountingof said beam-s. Moreover, when material is to be removed from a bin orcar of considerable height, the anchoring device is generally placedabove the top of the grain near the top wall of the enclosure at thebeginning of the unloading operation, and after a substantial quantityof the material has been removed, it is desired that the tail sheave bealso lowered to obtain the most eflicient operating conditions.

An important object of my invention is the provision of a tail sheavemounting device for a machine of the type above described which may bequickly and easily anchored to adjacent inside corner forming walls ofan enclosure, and which may be as readily removed there- .from whendesired.

Another object of my invention is the provision of a mounting devicewhich may be placed diagonally across .an inside corner of an enclosure,and which is provided with gripping teeth which are movable with respectrelative to each other and which are adapted to engage and penetrate thewalls of the enclosure whereby to firmly support a tail sheave.

' Still another object of my invention is the provision of operatingpair of gripping tooth-equipped bar elements v.ananchoring device as setforthwhich comprises a co- 2,892,606 Patented June 30, 1959 ice whichare movable relative to each other to produce shortening and elongationof the device, whereby to cause the teeth thereon to engage andpenetrate adjacent inside corner forming wall portions of an enclosureupon relative movements of said bar elements in a direction to causeelongation of the device.

A still further object of my invention is the provision of an anchoringdevice as set forth in which one of the gripping teeth thereof isextendible and retractible longitudinally of'the device and whereinnovel means is provided whereby when a load is applied to a pulleycarried by the device, said load will cause the teeth to penetratefurther into the wall-s of the enclosure.

Still another object of my invention is the provision of a tail sheaveanchoring device as set forth which is relatively simple and inexpensiveto manufacture, which is highly etficient in operation, which isrelatively light in weight, and which is rugged in construction andextremely durable in use.

The above, and still further highly important objects and advantageswill become apparent from the following detailed specification, appendedclaims and attached drawings.

Referring to the drawings, which illustrate the invention, and in whichlike characters indicate likeparts throughout the several views:

Fig. l is a fragmentary view partly in plan and partly in horizontalsection of a conventional railway car illustrating the use of apreferred form of my invention; 1

Fig. 2 is a view corresponding to a portion of Fig. 1 on an enlargedscale, some parts being broken away and some parts being shown insection, and illustrating a different position of some of the parts;

.Fig. 3 is a view corresponding to Fig. 2 but showing the parts in theposition of Fig. l;

. Fig. 4 is a view in side elevation of the inventionof Figs. 1 to 3.inclusive as seen from the line 44 of Fig. 3, some parts being removedand some parts broken away;

Fig. 5 is an enlarged transverse section taken substantially on the line5-5 of Fig. 4, some parts being broken away;

Fig. 6 is a view in end elevation of one of the gripping teeth of myinvention illustrated in Figs. .1 to 4 inclusive; Fig. 7 is a view inend elevation of the other'of the gripping teeth of Figs. 1 to 4inclusive;

Fig. 8 is a view corresponding to Fig. 2 but showing a modified form ofthe invention;

Fig. 9 is a view corresponding to Fig. 8 but showin a different positionof some of the parts;

. Fig. 10 is a view in side elevation of the form of the inventionillustrated in Figs. 8 and 9;

Fig. 11 is a view corresponding to' Fig. 2.but showing a still furthermodified form of the invention;

Fig. 12 is a view corresponding to Fig. 11 but showing a differentposition of some of the parts;

Fig. 13 is an enlarged fragmentary detail partly in section and partlyin side elevation, taken substantially on the line 1313 of Fig. 12; and

Fig. 14 is an enlarged fragmentary detail partly in section and partlyin side elevation, taken on the line 1414 of Fig. 12.

Referring with greater detail to'the drawings, and more particularly tothe preferred embodiment of the invention illustrated in Figs. 1 to 7inclusive, an enclosure in the nature of a conventional railway freightcar is indicated in its entirety by the numeral 1 and comprises a bottomwall or floor 2, opposed side walls 3 and 4 and'end walls 5, one ofwhich is shown. As shown, the side wall 4 is provided with an opening 6for the loading and unloading of material from the interior of thecar 1. A pull-forward or unloading cable 7 runs over a suitable pulley 8and is attached at one end to an unloading shovel or scoop 9, and apull-back or return cable runs over a similar pulley 11 and a tailpulley or sheave 12, one end thereof being attached to the scoop 9 asindicated at 13. The opposite ends of the cables 7 and 10 may be assumedto be wound upon suitable power driven winding drums as fully set forthin my prior Patent 2,646,965, and the pulleys 8 and 11 may be assumed tobe suitably mounted on a loading dock structure or the like not shown.

For the purpose of anchoring the tail sheave 12, I provide an anchoringdevice 14 comprising a bar element 15' and a cooperating second barelement 16 that is pivotally secured adjacent its outer end 17 to theinner end portion of the first bar element 15 as indicated at 18. Thebar element 15 is provided intermediate its ends with a depending handle19 by means of which'the device may be held while being placed inposition diagonally across the inside corner defined by'the angularlydisposed walls 3 and 5 of the car 1. The second bar element 16 isprovided with a handle member 20 whereby the bar element 16 may bepivotally moved from its angularly disposed position of Fig. 2 to aposition. generally parallel to the first bar element 15 as indicated inFig. 3. As shown, movement between these positions produces shorteningand elongation of the device as will hereinafter he described.

It will be noted that the bar element 15 is formed in the shape of agenerally rectangular tube. Mounted for extending and retractingmovements in the outer end portion of the bar element 15 is a third barelement 21a carrying a gripping tooth 21 having a relatively widesurface portion 22 at one side thereof and a sharp edge 23 in oppositionto the surface 22. As clearly shown in Figs. 2 and 3, the surface 22 andthe sharp edge 23 taper to a sharp point 24 at the outer end of thetooth 21. A pair of nut equipped bolts 25 extend transversely throughthe outer end portion of the bar element 15 in underlying relation tothe third bar element 21a carrying the gripping tooth 21, and cooperatewith internal wall surfaces of the bar element 15 to guide the tooth 21in its extending and retracting movements. A lever 26 is pivotallysecured to the gripping tooth 21 as indicated at 27, and extendslaterally outwardly through a slot 28 in one side wall of the barelement 15. One end 29 of the slot 28 provides a fulcrum for the lever26 the pur pose of which will hereinafter become apparent.

Rigidly secured, by means of nut equipped bolts or thelike 30 to theouter end of the second bar element 16'is a gripping tooth 31 having arelatively wide surface 32 and a sharp edge 33 opposed to the relativelywide surface 32. The surface 32 and edge 33 taper longitudinallyoutwardly to a relatively sharp point 34 at the outer end of the tooth31. It will be noted that the tooth 31 differs from the tooth 21 in thatthe surface 32 and edge 33 of the tooth 31 define converging arcs,whereas the surface 22 and edge 23 of the tooth 21 are straight. It willalso be noted particularly with reference to Fig. 2 that the tooth 21 islimited in its retracting movement in the bar element 15 by engagementwith one side edge of the lever 26 with the outer end 35 of the slot 28.

When it is desired to mount the anchoring device in a suitable corner ofthe car 1, the operator places the device 14 as illustrated in Fig. 2,with the bar elements 15 and 16 in angularly disposed positionswhereby.to cause shortening of the device. The gripping teeth 21 and 31 areforced into the end and side walls 5 and 3 respectively after which thebar element 16. is moved into parallel relationship with the bar element15 thereby causing elongation of the device and further penetration; ofthe gripping teeth 21, and 31 into the wall portions re spectivelyengagedthereby. The inner walls of boxcars and grain bins, preferablybeing made from wood, the teeth 21 and 31 penetrate the same-withrelative ease. A pulley mounting device comprises a flexible cable 36and is, secured at one end to the outer end of a lever; 26, and

.4 at its opposite end to a mounting lug 37 welded or otherwise securedto the outer end portion of the second bar element 16, and defines withsaid bar elements a closed loop. The tail sheave 12 is of the type incommon use including a frame 12a and an eye or hook 12b which engagesthe cable 36. With reference particularly to Fig. 3 it will be seen thatwhen the sheave 12 is under load or pulling strain of the cables 7 and10, the lever 26 tends to swing about its fulcrum 29 and move thegripping tooth 21 in a longitudinally outwardly extending direction.This movement causes both gripping teeth 21 and 31 to penetrate furtherinto the wall portions engaged thereby. Obviously, the greater the loadexerted upon the cable 36, the greater will be the tendency for thegripping teeth to penetrate into the enclosure walls. It will be notedthat the cable 36 is anchored sufficiently close to the outer ends ofthe bar elements 15 and 16 that there is little or no tendency for thebar elements 15 and 16 to be moved thereby out of parallel relationshipwhen load is placed upon the cable. When it is desired to remove theanchoring device 14 from engagement with the walls 3 and 5, it is merelynecessary that the cable 10 is slackened. Removal of the device iselfected by swinging the second bar element 16 outwardly to its angularposition of Fig. 2 at which time the tooth 31 may be withdrawn from thewall 3. Thereafter the tooth 21 is easily withdrawn from the wall 5.

In the modified form of' the invention illustrated in Figs. 8 to 10inclusive, a first bar element 38 comprises a pair of telescoping innerand outer sections 39 and 40. Pivotally mounted to the inner endof theelement 38 as indicated at 41 is a second bar-element 42 having rigidlysecured to its outer end a gripping tooth 43 which is adapted to engageand penetrate the adjacent wall portion 5 when the bar element 38 isplaced diagonally across the inside corner defined by the walls 3 and 5.A similar gripping tooth 44 is rigidly secured to the outer end of thethird section 40 for common extending and retracting movements therewithlongitudinally of the bar element 38., As shown in Figs. 8 and 9,movement of the bar element 42 from its angularly disposed position withrespect to the bar element 38 to a position in parallel relationshipwith the bar element 38 causes elongation of the device and consequentpenetration of the tooth elements 43 and 44 into their respectivelyengaged wall portions 5 and 3. In this form of the invention, thegripping teeth 43 and 44 are similar, each having flat sides 45 disposedopposite cooperating sharp edge portions 46, the relatively widesurfaces 45 and edges 46 converging outwardly and terminating in sharppoints 47. In this form of the invention as in that illustrated in Figs.1 to 7 inclusive, the relatively wide side surfaces of the grippingteeth face generally in the direction of the load imposed upon thedevice and reduce to a minimum the tendency of the engaged wall portionsto splinter or otherwise give way under strain. The second bar element42 at its inner end is provided with a handle 48whereby said second barelement may be easily moved between its angularly disposed positionrelative to the first bar element 38 and its position parallel thereto.Preferably, this form of the invention is mounted in such a manner thatthe second bar element 42 swings in a horizontal plane. However,operation of" the device is equally effective if the same is placeddiagonally across an inside corner defined by a vertical wall and ahorizontal top or bottom wall of an enclosure. Obviously, in this event,the. bar element 42 would swing in a vertical plane.

A toggle joint 49 comprises a pair of toggle links 50 and 51 pivotallysecured together at their-adjacent ends as indicated at52. Thefree endof the toggle link 50 is: pivotally mounted adjacent the inner end ofthe bar element 38, as indicated at 53, in spaced relation to thepivotal connection 41. The toggle link 51 likewise. has its free endpivotally secured to the section4ll as indicated at 53' in closelyspaced relation to. the gripping tooth 44. Preferably the toggle joint49 moves in a horizontal plane orin a plane parallel to the plane ofswinging movement of the bar element 42. Relative angular movementbetween the toggle links 50 and 51 imparts extending andretracting-movements to the tooth equipped section 40. A drawbar 54 isprovided at its opposite ends with loops or eyes 55 and 56 the former ofwhich encompasses the pivot joint 52 of the toggle link 49, and thelatter of which is adapted to have mounted thereon the tail sheave 12.The drawbar 54 extends transversely between the movable section 40 and aguide rail 57 which guide rail extends parallel to the bar element '38and is formed to provide downturned ends 58 which are welded orotherwise rigidly secured to the movable section 40. The guide rail 57permits lateral swinging movement-of the drawbar 54 but restrains thesame against swinging-movement in a vertical plane or in a plane atright angles 'to the planes of swinging movement of the toggle joint 49and the second bar element 42. As shown by ;full and dotted lines inFig. 9, when the device has been suitably mounted to the walls 3 and 5,a load'applied to the drawbar 54 will cause tooth extending movements tobe imparted to the toggle joint 49. Obviously an increase in load on thedrawbar 54 will cause increased penetration of the gripping teeth 43 and44 into their respective walls and 3. The arrangement in this form ofthe invention like that illustrated in Figs. 1 to '8 inclusive, is suchthat, when a load is applied to the drawbar 54, the tendency towardelongation of the device overcomes any tendency for the second barelement 42 to swing outwardly away from parallel relationship with thebar element 38. However, as a safety measure, 'I provide a hook element59 that is secured at one end tothe bar section 39 and which has adepending hook element 59 which is adapted to engage an outer ,edgeportion of the bar element 42 to hold the same against accidentalswinging movement away from said parallel relationship. Obviously, ifdesired, a similar hook arrangement may be applied to the preferred formof the invention illustrated to Figs. 1 to 7 inclusive.

In the modified form of the invention illustrated in Figs. -11 to 14inclusive, a pair of bar elements 60 and 61 are connected for relativemovements causing elongation and shortening of the device by a lazy tongarrangement comprising a pair of opposed toggle joints 62 and 63 theformer of which includes toggle link 64 and .a lever 65 and the latterof which includes a similar lever 66 and toggle link 67. Preferably andas shown, the free ends of the link 64 and lever 66 are pivotallysecured to opposite ends of the bar element 60 as indicated at 68 and 69respectively whereas the free ends of the lever 65 and link 67 arepivotally secured to opposite ends of the bar element 61 as indicated at70 and 71 respectively. A rigid link 72 is pivotally secured at one endto the pivotal connection 73 between the link 64 and lever 65, and atits other end to the lever '66 as indicated at 74. A second link 75 issimilarly pivotally secured at one end to the pivotal connection 76between the lever 66 and toggle 'link 67 and at its other end to thelever 65 as indicated ,at 77. The links 72 and 75 transfer movements ofone of 'the toggle joints 62 or 63 to the other thereof so that duringrelative movements between the bar elements 61) and 61, said barelements are maintained in substantially parallel arrangement.

Means for imparting movements to the toggle joints 62 and 63 to causeelongation or shortening of the device comprises a threaded shaft 78that has screw threaded engagement with a nut-acting element 79 whichforms the pivotal connection 76. The shaft 78 is journalled in a boss 80which forms a part of the pivotal connection 73 and which supports thegenerally U-shaped bearing 81. The outer end portion 82 of the shaft 78is journalled in the bearing or yoke 81 and has mounted thereon a bevelgear 83 which has meshing engagement with a second bevel gear 84 mounted.on a shortshaft 85 that-is 6 journalled in a bearing boss '86 on theintermediate portion of the yoke 81. At its lower end, the shaft isprovided with a cross sectionally polygonal head 87 which is engageableby a suitable :socket wrench or the like shown by dotted lines in Fig.13 and indicated at '88.

A pair of plate-like third bar members 89 and 90 are hinged one each toa respective bar element 60 and 61, as indicated at 91, and have mountedthereon gripping teeth 92 which are adapted to engage and penetrate theside and end walls '3 and '5 of the enclosure. A toggle joint 93comprises a pair of pivotally connected toggle links '94 and 95 theformer of which has its outer end pivotally connected to the free endportionof the member 89, and the latter of which has its outerendpivotallysecured to the bar element 60. The link 94 is provided at itsinner end with a stop lug 96 which permits relative swinging movementbetween the links 94 and 95 to a point slightly'beyond dead centerrelationship. Asshown, when the toggle links 94 and '95 are in theirangularly disposed relationship of Fig. '11, the teeth 92 on the member89 are in a retracted position with respect to their cooperating barelement 60; and when said toggle links 94 and 95 are moved to theiropposite extreme position of Fig. 12 the teeth 92 of the member 89 aremoved to their extended anchoring position wherein the platelike member89 lies against the end wall 5 of the enclosure. The plate-like member90 and its cooperating bar element 61 are likewise connected by a togglejoint 97 which is identical to the toggle joint 90 and which comprisescooperating toggle links 98 and '99, the former of which is providedwith a stop lug 100. The operation of the toggle joint 97 is identicalto that of the toggle joint 93 and operates to cause penetration of theteeth 92 into the side wall 3 of the enclosure. A pair of coil tensionsprings 101 are connected one each between one of the bar elements 60and 61 and its respective cooperating toothed plate-like member 89 and90, whereby to yieldingly bias the gripping teeth in the direction oftheir retracted positions.

A pulley mounting cable 36' is connected at one end to the pivotalconnection between the links 94 and 95 of thetogg'le joint 93 "by meansof a link 102, and at its other end to the pivotal connection betweenthe links 98 and 99 of the toggle joint 97 by a link 103.

'The form of the invention shown in Figs. '11 to 14 inclusive is placedin desired position in the inside corner defined by the walls 3 and 5 ofthe enclosure, and the screw 78 rotated until the hinged ends '91 of themembers 89 and 90 make contact with their respective walls 5 and 3. Atthis point it will be noted that the gripping teeth 92 have penetratedsufiiciently into the walls of the enclosure to support the device andto exert nominal resistance to a 'loadplaced'upon-the pulley mountingcable 36'. The tail sheave 12 is mounted on the cable 36' as describedin connection with the foregoing forms of the invention illustrated.'Then when a load is applied to the tail sheave [12 and cable 36', thetoggle joints 90 and 97 are moved toward their positions of Fig. 12.Obviously as the load increases, the teeth 92 penetrate further into thewalls until the toggle joints 90 and 97 reach their extreme toothextending positions of Fig. 12. Release of the device of Figs. 11 to 14inclusive is accomplished by rotating the threaded shaft 78 in adirection to impart movement of the bar elements 60 and 61 in directionscausing shortening of the device. If desired, the toggle joints 90 and97 may be manually moved to their positions of Fig. 11 when the cable 36has been relieved of its load, thereby reducing the amount of turning ofthe threaded shaft 78 necessary to remove the device.

My invention has been thoroughly tested and found'to be completelysatisfactory for the accomplishment of the objectives set forth; andwhile I have shown and described a preferred embodiment of ,my novelpulley supporting device and two modifications thereof, it will beunderstood that the same is capable of further modification withoutdeparture from the spirit and scope of the invention as defined in theclaims.

What I claim is:

l. A manually settable and releasable corner anchor for pulleys and thelike comprising a pair of interconnected bar elements extensible betweenouter end portions thereof for relative expanding and contractingmovements of said anchor, primary operating means at the inner endportion of one of said bar elements for setting and releasing movements,a wall gripping tooth portion mounted on the outer end of one barelement, a third bar element connected to the outer end portion of theother of said pair of interconnected bar elements for relative expandingand contracting movements thereof and having a wall gripping toothportion, actuating means interconnecting said third bar element and oneof the first two bar elements and a pulley mounting device having endportions connected respectively to one of said bar elements and to saidactuating means and operative under load to cause movement of said thirdbar element in a direction to increase wall gripping action of its toothportion.

2. The structure defined in claim 1 in which said teeth providerelatively wide surface portions adapted to face generally in thedirection of the load applied to said pulley mounting device, and sharpedge portions in opposition to said relatively wide surfaces, saidsurfaces and edge portions tapering to points at the outer ends of saidteeth.

3. A releasable corner anchoring device for pulleys and the likecomprising, a pair of cooperating bar ele-' ments, pivot meansconnecting the bar elements for rel ative movements producing elongationand shortening of the device, opposed outwardly extending gripping teethoperatively associated with said bar elements and adapted to engage andpenetrate adjacent angularly disposed inside corner forming wallportions of an enclosure upon relative elongating movementof said barelements, means mounting and guiding one of said teeth for independentextending and retracting movements with respect to its associated barelement, lever means for imparting said independent extending movementsto said movable tooth, and a pulley mounting device connected to saidlever means and operative to move said lever means in a tooth extending,direction to cause further penetration of said teeth into said enclosurewall portions responsive to application of a load to said pulleymounting device.

4. A releasable corner anchoring device for pulleys and the likecomprising, a pair of cooperating bar elements, means pivotallyconnecting said bar elements together for relative swinging movementsbetween angularly disposed relationship and generally parallelrelationship to provide shortening and elongation respectively of thedevice, opposed outwardly extending gripping teeth operativelyassociated with said bar elements and adapted to engage and penetrateadjacent angularly disposed inside corner forming wall portions of anenclosure upon relative elongating movement of said bar elements, one ofsaid teeth being mounted on its associated bar element for independentextending and retracting movements with respect thereto, lever means forimparting said independent extending movements to said movable tooth,and a pulley mounting device connected to said lever means and operativeto move said lever means in a tooth extending direction to cause furtherpenetration of said teeth into said enclosure wall portions responsiveto application of a load to said pulley mounting device.

5. A releasable corner anchoring device for pulleys and the likecomprising, a pair of cooperating bar elements, means pivotallyconnecting said bar elements together for relative swinging movementsbetween angularly disposed relationshipand generally parallelrelationship to provide shortening and elongation respectively of thedevice; opposed outwardly extending gripping teeth operativelyassociated with said bar elements and adapted to engage and penetrateadjacent angularly disposed inside corner forming wall portions of anenclosure upon relative elongating movement of said bar elements, meansmounting one of said teeth for telescopic sliding movements between alongitudinally extended position and'a retracted position with respectto its associated element, lever means for imparting extending movementsto said movable tooth, and a pulley mounting .device connected to saidlever means and operative to move said lever means in a tooth extendingdirection to cause further penetration of said teeth into said enclosurewall portions responsive to application of a load to said pulleymounting device.

6. A releasable corner anchoring device for pulleys and the likecomprising, first and second bar elements, a longitudinally extendinggripping tooth mounted'on the outer end portion of said first barelement. for extending and retracting movements longitudinally thereof,a second longitudinally. outwardly extending gripping tooth rigidlymounted on the outer end of said second bar element, said second barelement being pivotally mounted adjacent its tooth equipped outer end tothe inner end of said first bar element for relative swinging movementbetween one extreme position angularly of said first bar element andanother extreme position generally parallel to said first bar element toprovide shortening and elongation respectively of said device, saidteeth being adapted to engage and penetrate adjacent angularly disposedinside corncr forming wall portions of an enclosure upon relativeelongating movement of said bar elements, lever means for impartingextending movements to said movable tooth, and a pulley mounting deviceconnected to said lever means and operative to move said lever means ina tooth extending direction to cause further penetration of said teethinto said enclosure wall portions responsive to application of a load tosaid pulley mounting device.

7. A releasable corner anchoring device for pulleys and the likecomprising, first andsecond bar elements, a longitudinally extendinggripping tooth mounted on the outer end portion of said first barelement for extending and retracting movements longitudinally thereof, asecond longitudinally outwardly extending gripping tooth rigidly mountedon the outer end of said second bar element, means connecting the barelements for relative movements producing elongation and shortening ofthe device, said teeth being adapted to engage and penetrate adjacentangularly disposed inside corner forming wall portions of an enclosureupon relative elongating movement of said bar elements, a leveroperatively engaging said movable tooth and fulcrumed on said first barelement, and a pulley mounting device secured at opposite ends to saidlever and said second bar element longitudinally outwardly of theconnecting means therebetween and said first bar element and operativeto move said lever in a tooth extending direction to cause furtherpenetration of said teeth into said enclosure wall portions responsiveto application of a load to said pulley mounting device.

8. A releasable corner anchoring device for pulleys and the likecomprising, first and second bar elements, a longitudinally extendinggripping tooth mounted on the outer end portion of said first barelement for extending and retracting movements longitudinally thereof, asecond longitudinally outwardly extending gripping tooth rigidly mountedon the outer end of said second bar element, said second bar elementbeing pivotally mounted adjacent its tooth equipped outer end to theinner end of said first bar element for relative swinging movementbetween one extreme position angularly of said first bar element andanother extreme position generally parallel to said first bar element toprovide shortening and elongation respectively of said device, saidteeth being adapted to engage and peneiidifi; adjacent angularlydisposed inside corner forming wall portions of an enclosure uponrelative elongating movement of said bar elements, a lever fulcrumed onsaid first bar element and operatively engaging said movable grippingtooth, and a pulley mounting device secured at one end to said lever andat its other end to said second bar clement longitudinally outwardly ofits pivotal connection with said first bar element and operative to movesaid lever in a tooth extending direction to cause further penetrationof said teeth into said enclosure wall portions responsive toapplication of a load to said pulley mounting device.

9. A releasable corner anchoring device for pulleys and the likecomprising, an elongated tubular bar element, a longitudinally extendinggripping tooth, means in the outer end of said bar element mounting andguiding said tooth element for extending and retracting movementslongitudinally of said bar element, a second bar element, means mountingsaid second bar element adjacent its outer end to the inner end portionof said first mentioned bar element for relative swinging movementsproducing elongation and shortening of the device, a secondlongitudinally outwardly extending gripping tooth rigidly mounted on theouter end of said second bar element, said teeth being adapted to engageand penetrate adjacent angularly disposed inside corner forming wallportions of an enclosure upon relative elongating movement of said barelements, said first mentioned bar element having a longitudinallyextending slot defining a fulcrum, a lever extending through said slotand operatively engaging said movable tooth within said first mentionedbar element and said fulcrum, and a pulley mounting device connected atone end to said lever and at its other end to said second bar elementintermediate its outer end and the pivotal mounting means and operativeto move said lever in a tooth extending direction to cause furtherpenetration of said teeth into said enclosure wall portions responsiveto application of a load to said pulley mounting device.

10. The structure defined in claim 9 in which said pulley mounting meanscomprises a flexible cable having a length greater than the maximumdistance between said lever and the outer end of said second barelement.

11. The structure defined in claim 9 in which said teeth providerelatively wide surface portions adapted to face generally in thedirection of the load applied to said pulley mounting device, and sharpedge portions in opposition to said relatively wide surfaces, saidsurfaces and edge portions tapering to points at the outer ends of saidteeth.

12. The device according to claim 1 wherein said actuating meanscomprises a toggle joint comprising a pair of pivotally connected togglearms the free end of one of which is pivotally connected to one of saidbar elements and the free end of the other of which is pivotallyconnected to the movable gripping tooth on said third bar element, and apulley mounting device secured to said toggle joint and extending in adirection wherein a load applied thereto will impart extending movementto said movable gripping tooth to cause further penetration of saidteeth into said enclosure wall portions.

13. The device according to claim 1 wherein the actuating meanscomprises a toggle joint comprising a pair of pivotally connected togglearms the free end of one of which is pivotally connected to one of saidfirst mentioned bar elements and the free end of the other of which ispivotally connected to the movable gripping tooth on said third barelement and a pulley mounting device secured to said toggle joint andextending in a direction wherein a load applied thereto will impartextending movement of said movable gripping tooth to cause furtherpenetration of said teeth 1.1 .0 said enclosure wall portions.

14. The structure defined in claim 13 in which said toggle joint ismovable in a plane parallel to the plane of swinging movement of saidprimary operating means.

15. The structure defined in claim 13 in which said movable toothincludes an elongated tubular sleeve telescopically receiving said thirdbar element.

16. The structure defined in claim 1 wherein the actuating meanscomprises a toggle joint comprising a pair of pivotally connected togglearms the free end of one of which is pivotally connected to said firstbar element and the free end of the other of which is pivotallyconnected to the movable gripping tooth portion on said third barelement, said toggle joint being movable in a horizontal plane to extrndand retract said movable gripping tooth, a pulley mounting devicecomprising a drawbar connected to said toggle joint and extendingtransversely of said first bar element, whereby a load applied to saiddrawbar will impart movement to said toggle joint in a tooth extendingdirection to cause further penetration of said gripping teeth into saidenclosure wall portions, and means on said first bar clement permittingswinging movements of said drawbar in a horizontal plane and restrainingsaid drawbar against movements in a vertical plane.

17. The structure defined in claim 16 in further combination with meansfor releasably locking said interconnected bar element in parallelrelationship.

18. The structure defined in claim 1 in which the means forinterconnecting said bar elements comprises opposed toggle jointspivotally connected at their opposite ends to said ba: elements and infurther combination with mechanism operatively associated with both ofsaid toggle joints for imparting simultaneous expanding and retractingmovements thereto.

19. The structure according to claim 1 wherein said first mentionedgripping tooth portion is movable relative to its bar element, andincluding additional actuating means for said first mentioned grippingtooth portion.

20. The structure defined in claim 19 in which said actuating means andsaid additional actuating means comprises a pair of toggle joints oneeach operatively associated with each of said bar elements and acooperating gripping tooth, said toggle joints being movable betweenextreme tooth retracted positions and dead center relationship whereinsaid gripping teeth are fully extended.

21. The structure defined in claim 20 in further combination with stopmeans limiting movement of said last mentioned toggle joints in a toothextending direction, the limit of said movement being slightly over deadcenter relationship of said toggle joints.

22. The structure defined in claim 21 in further combination withyielding means urging said tooth mounting means in a tooth retractingdirection.

References Cited in the file of this patent UNITED STATES PATENTS 36,187Wood Aug. 12, 1862 795,523 Leasure et a1 July 25, 1905 1,281,936 FrenchOct. 15, 1918 1,409,800 Turner Mar. 14, 1922 1,756,716 Whitney Apr. 29,1930 1,793,035 Whitney Feb. 17, 1931 2,231,428 Martin Feb. 11, 19412,305,381 Frauenheim Dec. 15, 1942 2,411,900 Seward Dec. 3, 19462,470,396 Guerette May 17, 1949 2,532,168 Jokoubek Nov. 28, 1950 FOREIGNPATENTS 613,299 Germany May 16, 1935 667,434 Great Britain Feb. 27, 1952

